九九乘法表

num2 = 1
num1 = 1
while num2 <= 9:
    num = 1
    while num <= num1:
        print(num,end="X")
        print(num1,end="=")
        sum = num * num1
        print(sum,end=" ")
        num = num + 1
    num1 = num1 + 1
    print("")
    num2 = num2 + 1



简化版

first = 1
while first <= 9:
    second = 1
    while second <= first:
        print(str(second)+"X"+str(first)+"="+str(second*first),end="    ")
        second += 1
    print("")
    first += 1